HA: Light Bulb Colour Patterns

 IoT devices can usually be controlled from their own app, from Google Home (GH) and Home Assistant (HA), each method has its own features.  I expect the app to have the best level of control, and a subset of that to be available when linked to GH.  HA features are implemented by the community and are typically much better than GH.  For my FCMILA cheapo coloured lightbulb the Tuya / Smart Life app doesn't allow you to do very much.  There is one "scene" called "gorgeous" which displays an pleasing range of colours but it isn't available on GH or HA.  This lead me to investigate the ability to set up HA to display a sequence of colours.

Looking at HA Developer tools/state you can see the current configured parameters for the bulb.  Within Developer Tools/ services you can can configure and test a service to turn the light on with a colour of your choice.

It is now simple to create a script calling this service so that the bulb colour can be changed.  At this stage we want to set up a sequence of colour changes.  It is easier to do this in text mode rather than the user interface.  We simply edit a script which causes a single colour to be displayed and copy/repeat the text for each colour we want.  We change the RGB colour values to  the ones we want and then add a delay action between each section.  We now have a script which displays a sequence of colours, each for 1 second.  Finally we need to add a loop to the script.  Looking at the scripting documentation I setup a "for loop" script in which I can specify how many times the sequence will be displayed.

The completed script can be run from the dashboard or exported to Google Home via Home Assistant cloud so that it can be run with a voice command.